Datetime picker not showing inside updatepanel after partial postback

Issue: dattime picker not showing after partial postback
Solution:

<script type="text/javascript">

 function pageLoad(sender, args) {
            $('#<%=txtDate.ClientID %>').datepicker({
                changeMonth: true,
                changeYear: true

            }
            );
        }  

Reference: http://stackoverflow.com/questions/7823969/javascript-in-update-panel-doesnt-work-after-partial-postback